Praxair Technology, Inc.

James Donald Borkman

Mark Leonard Malczewski

Richard B Mazzarella

Hollis C Demmin

The invention is a method and a device for measuring the filtering or purifying capacity of a purifier. The invention allows the use of a single analyzer for sampling the inlet and outlet streams. This is accomplished by sampling the inlet stream only at some times when the change in the inlet stream is expected to occur. At other times the outlet stream is sampled to monitor its composition. A computer system on the basis of the accumulated data decides when it is time to replace or to regenerate the purifier or the filter bed. The computer system also determines the strategy of when to sample the inlet stream. Various system sensors may be used to make this determination, such as pressure sensors and level sensors. The data from other sensors, such as flow sensors, may be used in the calculations performed by the computer system.

Life prediction for gas purifiers

A method for correcting an output from an electrochemical cell sensor, having an output responsive to a concentration of sensed species in a stream, a pressure and a temperature in an interactive non-linear relationship, comprising the steps of providing a pressure sensor for producing an output responsive to a pressure in proximity to the electrochemical sensor; providing a temperature sensor for producing an output responsive to a temperature of said electrochemical sensor; and processing the outputs of the electrochemical sensor, pressure sensor and temperature sensor in a neural network having an output function which compensates said electrochemical sensor for changes in pressure and temperature to indicate a concentration of the sensed species. An apparatus is also provided, for compensating an electrochemical sensing apparatus, comprising an electrochemical sensor, being responsive to a sensed species, and an environmental variable; an environmental variable sensor, being responsive to said environmental variable; and a compensation network for producing a compensated output based on an output of said electrochemical sensor based and an output of said environmental variable sensor, said network comprising a neural network.

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Clarence, NY, United States of America

James Donald Borkman